화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.71, 425-434, March, 2019
Mechanistic insights into nature of complexation between aluminum and phosphates in polyaluminum chloride treated sludge for sustainable phosphorus recovery
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Efficiency of phosphorus recovery from polyaluminum chloride sludge is determined by chemical interactions between Al and P. Chemical structure of Al.P complex and their binding mechanisms in the PAC sludge were investigated with spectroscopy and chemical fractionation. More than 98% of the P was bound with Al, out of which 70% was strongly bound. The ATR-FTIR analysis indicates that the majority of the P formed inner sphere complex with Al through ligand exchange. The availability of highly protonated surface for P sorption at low pH also supports the formation of Al-P outer sphere complex.
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